April 13, 2011

Scientists Find Link Between Climate Events, Tectonic Plates

Scientists have found a link between intensifying climate events and tectonic plate movements in findings that could provide a valuable insight into why huge tremors take place.

Understanding why plates change direction and speed is key to unlocking huge seismic events like last month's Japan earthquake, which shifted Earth's axis by several inches.

The researchers from France and Germany found that the strengthening Indian monsoon had accelerated movement of the Indian plate over the past 10 million years by a factor of about 20 percent.

Australian lead researcher Giampiero Iaffaldano said Wednesday that although scientists have long known that tectonic movements influence climate by creating new mountains and sea trenches, his was the first study to ever show the reverse.

"The closure or opening of new ocean basins or the build of large mountain bands like the Andes or Tibet itself, those are geological processes that affect the pattern of climate," Iaffaldano, an earth scientist with the Australian National University, told the AFP news agency.

"We are showing for the first time that the opposite also is true, that the pattern of climate is then able to affect back in a feedback mechanism the motion of tectonic plates."

Iaffaldano said his study did not mean that global warming would translate to stronger earthquakes happening more often.

"Of course earthquakes do occur at the boundaries between plates because of plate motions, but our work doesn't imply at all that we will see an increase in these types of events," he told AFP.

He collaborated with Universite de Rennes geoscientists Laurent Husson and Hans-Peter Bunge from Munich's LMU university on the study.

The researchers plan to build on the study by probing whether climate events have had a similar impact in other regions.

"For example I can imagine that there might be a signature of climate in the Andes for example or in the Rocky Mountains," Iaffaldano told AFP.

"This is something that we should look at in the future."

The study was published in the Earth and Planetary Science Letters journal.